About advanced duplication
Advanced duplication lets you specify more than one duplication rule. Vault determines which media server wrote each backup image and then applies the duplication rule corresponding to that media server to that image. In this context, the media server does not have any effect other than to identify which rule to apply to each image.
Note:
Alternate read servers and multiple media servers apply to NetBackup Enterprise Server only.
If a duplication rule does not specify an alternate read server, the media server that originally wrote the backup image is used to read the original backup image during the duplication process.
Use advanced configuration only if you need to control exactly how to assign the backup images to be duplicated.
The following statements may help you understand why you should use advanced configuration:
Note:
You do not need to configure advanced options if your profile duplicates images that are backed up by a single media server.
Your robot has different types of drives or media so that you have different storage units to use as destinations for the duplication process. In this case, you may want to balance the duplication job between multiple storage units. For example, you may want to send the duplicate copies of all backup images that are written by one media server to a storage unit of one density and all backup images that are written by another media server to a storage unit of another density.
Your profile is duplicating backup images to different media servers, each writing different types of data that require different retention periods. For example, if media server A backs up your customer database and media server B backs up warehouse inventory data, you may want to keep your customer database in off-site storage for a longer period of time (a different retention) than your warehouse inventory data.
You have one media server that you need reserved for other operations. For example, you use multiple media servers for duplication but dedicate one media server for backups. For that one media server you specify an alternate read server, and you let the rest of the media servers handle their own duplication.
Note:
You do not need to configure advanced options if your profile duplicates images that are backed up by a single media server.
To avoid sending data over the network, do the following:
For each duplication rule that does not specify an alternate read server, ensure that the media server controls both the source volumes and the destination storage units.
For each duplication rule that specifies an alternate read server, ensure that
The alternate read server is connected to all robots that have backup images written by the media server specified for this rule.
The alternate read server is the same server as the media server of the destination storage unit.
